<template>
	<view>
		<my-search @click='gotoSearch'></my-search>
		<view class="scroll-view-container">
			<!-- 左侧滑动区域 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height:wh+'px'}">
				<block v-for="(item,index) in cateList" :key="index">
					<view :class="['left-scroll-ivew-item', index===active ? 'active' : '']" scroll-y="true" @click="activeChange(index)">{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<!-- 右侧滑动区域 -->
			<scroll-view class="right-scroll-view" scroll-y :style="{height:wh+'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,index2) in cateLevel2" :key="index2">
					<view class="cate-lv2-title">
						/ {{item2.cat_name}} /
					</view>
					<!-- 动态渲染三级分类的列表数据 -->
					<view class="cate-lv3-list">
						<!-- 三级分类item项 -->
						<view class="cate-lv3-item" v-for="(item3,index3) in item2.children" :key="index3" @click="gotoGoodsList(item3)">
							<!-- 图片 -->
							 <image :src="item3.cat_icon.replace('dev','web')"></image>
							<!-- 文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		mixins: [badgeMix],
		data() {
			return {
				//当前设备可用高度
				wh:0,
				cateList:[],
				active:0,
				// 二级分类列表
				cateLevel2:[],
				// 滚动条距离顶部的距离
				scrollTop:0
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			// 可用高度 = 屏幕高度 - navigationBar高度 - tabBar高度 - 自定义的search组件高度
			this.wh = sysInfo.windowHeight - 50
			this.getCateList()
		},
		methods:{
			async getCateList(){
				const {data:res} = await uni.$http.get('/api/public/v1/categories')
				if (res.meta.status !== 200) {
					uni.$showMsg()
					return
				}
				this.cateList = res.message
				this.cateLevel2 = res.message[0].children
			},
			activeChange(index){
				this.active = index
				this.cateLevel2 = this.cateList[index].children
				// 让scrollTop的值在0和1之间切换
				this.scrollTop = this.scrollTop === 0?1:0
			},
			gotoGoodsList(item3){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid=' + item3.cat_id 
				})
			},
			//跳转到分包中的搜索页面
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
			
		}
	}
</script>

<style lang="scss">
.scroll-view-container{
	display: flex;
}
.left-scroll-view{
	width: 120px;
}
.left-scroll-ivew-item{
	background-color: #f7f7f7;
	line-height: 60px;
	text-align: center;
	&.active{
		background-color: #ffffff;
		position: relative;
		&::before{
			content: ' ';
			display: block;
			width: 3px;
			height: 30px;
			background-color: #c00000;
			position: absolute;
			top: 50%;
			left: 0;
			transform: translateY(-50%);
		}
	}
}
.cate-lv2-title{
	font-size: 12px;
	font-weight: bold;
	text-align: center;
	padding: 15px 0;
}
.cate-lv3-list{
	display: flex;
	flex-wrap: wrap;
	.cate-lv3-item{
		width: 33.33%;
		margin-bottom: 10px;
		display: flex;
		flex-direction: column;
		align-items: center;
		image{
			width: 60px;
			height: 60px;
		}
		text{
			font-size: 12px;
		}
	}
	
}
</style>
